#include <graphics.h>
#include <conio.h>
#include <math.h>
#define width 640
#define height 480
#define pi 3.1415
void main(){
initgraph(width,height);
int x,y,r=200.0;
setorigin(width/2,height/2);
int c;
for(double i=0;i<pi*2;i+=0.0001){
	x=r*cos(i);
	y=r*sin(i);
	c=i*255/(2*pi);
	setlinecolor(RED);
	line(0,0,x,y);
}
_getch();
closegraph();
}